The term urolithiaisis (Greek-'ouron' for urine, 'oros' for flow, and 'lithos' for stone) refers to the formation of solid concretions consisting of both protein and crystalline materials in the lumen of urinary tract attached to the uro-epithelium [1]. Urolithiasis is a major health problem that affects 12% of the global population [2].It is more prevalent between the ages of 20 to 40 in both sexes, with a male to female ratio of 2:1 [3]. Urinary calculi may have various compositions which include: calcium oxalate (monohydrate or dihydrate), struvite (magnesium ammonium phosphate), uric acid, calcium phosphate, and cystine. There are other less common stones, including xanthine and drug-related stones as well. Globally, calcium oxalate is considered as the main constituent in the renal calculi and represents about 80% of all the cases [4,5]. A wide range of medicinal plants have been used in different countries and cultures as a prophylactic and curative agent for urolithiasis [6,7,8]. They have been used conventionally for urolithiaisis due to their cost effectiveness, fewer side effects and because they contain numerous phytochemicals that show beneficial effects in urolithiasis [9]. Maerua angolensis Figure 1 is traditionally used in the treatment of urolithiasis in Eritrea. It is a shrub or small tree, usually growing 5-6 m tall but with reports of some trees up to 10m tall. The plant is often rather rambling, with spreading or drooping